RESEARCH ON BROADENING APPLICATION OF SLIT LOCAL STRESS RELIEVING AND SLIT ELASTIC MODULUS TEST
LIU Yunfang，AI Kai，YIN Jianmin，XU Jing
(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，
Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China)
Abstract：In the stability analysis of underground caverns，the stress state on key parts of surrounding rock of the cavern?s cross-section is essential，and it is obtained by the geostress measurement and analysis. The geostress measurement is time-consuming and costly，especially in the high geostress region，it is more difficult to obtain reliable measured data；therefore there is often lack of an important basis for the stability analysis of underground cavern. The critical information to evaluate cavern stability is stress state of the wall rock on the cross-section，so the stress state measurement adopting slit local stress relieving method on the key parts of the wall rock is suggested；the two-dimensional stress state on rock wall can be determined provided gouging of more than 3 narrow slots of different directions on the measured site and measuring the deformation caused by the gouge. After the slit rock elastic modulus test in the site，the test results are widely applied，i. e. continue improving pressure of steel pillow buried in the narrow slot in the test，until the displacement caused by it offsets the displacement caused by gouging narrow slot，hypothetical normal stress on perpendicular bisector of the narrow slot is measured；and then to calculate the wall stress of surrounding rock；as a supplement to the measured wall rock stress by slit local stress relieving method and confirm each other. Good result is obtained in the example of engineering application.
2013, Vol. 32 
